Lead isotopic compositions in the EPICA Dome C ice core and Southern Hemisphere Potential Source Areas

Vallelonga, Paul; Gabrielli, Paolo; Balliana, Eleonora; Wegner, Anna; Delmonte, Barbara; Turetta, Clara; Burton, Graeme; Vanhaecke, Frank; Rosman, K.J.R.; Hong, Sungmin; Boutron, C.F.; Cescon, Paolo; Barbante, Carlo

doi:10.1016/j.quascirev.2009.06.019

Cited by 94 publications

(143 citation statements)

References 48 publications

(62 reference statements)

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“…A high IRM points to a local source of higher density dust particles (iron oxides). This idea is consistent with a Holocene local volcanic dust contribution to Dome C (Vallelonga et al, 2010) and with the higher superchondritic fluxes of siderophilic elements to East Antarctica during the Holocene (higher in EDC than in Vostok ice) (Gabrielli et al, 2006b). .…”

Section: Ree Patterns Comparisonsupporting

confidence: 81%

A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice

Gabrielli

Wegner

Petit

et al. 2010

Quaternary Science Reviews

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a b s t r a c tWe present the first Rare Earth Elements (REE) concentration record determined in 294 sections of an Antarctic ice core (EPICA Dome C), covering a period from 2.9 to 33.7 kyr BP. REE allow a detailed quantitative evaluation of aeolian dust composition because of the large number of variables (i.e. 14 elements). REE concentrations match the particulate dust concentration profile over this period and show a homogeneous crustal-like composition during the last glacial stage (LGS), with only a slight enrichment in medium REE. This signature is consistent with the persistent fallout of a mixture of dust from heterogeneous sources located in different areas or within the same region (e.g. South America). Starting at w15 kyr BP, there was a major change in dust composition, the variable character of which persisted throughout the Holocene. This varying signature may highlight the alternation of single dust contributions from different sources during the Holocene. We observe that the frequent changes in REE composition at the onset of the Holocene (10-13.5 kyr BP) are linked to dust size and in turn to wind strength and/or the path of the atmospheric trajectory. This may indicate that atmospheric circulation dictated the composition of the dust fallout to East Antarctica at that time. Although the dust concentrations remained fairly low, a notable return towards more glacial dust characteristics is recorded between 7.5 and 8.3 kyr BP. This happened concomitantly with a widespread cold event around 8 kyr BP that was 400-600 years long and suggests a moderate reactivation of the dust emission from the same potential source areas of the LGS.Published by Elsevier Ltd.

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Section: Ree Patterns Comparisonsupporting

confidence: 81%

A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice

Gabrielli

Wegner

Petit

et al. 2010

Quaternary Science Reviews

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“…This less radiogenic signature is representative of dust aerosols generated in southeastern Australia (Deckker et al, 2010). Our Pb isotopic signature for the pre-MBE indicates that dust transported to Antarctica could be sourced from Australia, which is inconsistent with the findings of Vallelonga et al (2010), who pointed out that Australian dust is not a major component of Antarctic 23001-p.3 E3S Web of Conferences dust, whatever the period.…”

Section: Resultscontrasting

confidence: 84%

Trace elements and Pb isotope records in Dome C (East Antarctica) ice over the past 800,000 years

Hong

Han

Hwang

et al. 2013

E3S Web of Conferences

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Abstract. Trace elements (V, Cr, Mn, Fe, Co, Cu, Zn, As, Rb, Sr, Mo, Cd, Sb, Ba, Tl, Pb, Bi, Th and U) and Pb isotopic compositions from the EPICA (European Project for Ice Coring in Antarctica) Dome C ice core have been determined using inductively coupled plasma sector field mass spectrometry (ICP-SFMS) and thermal ionization mass spectrometry (TIMS), covering the period from ~533 kyr BP to ~800 kyr BP, respectively. Our data have enabled us to extend the previous EDC records of trace elements and Pb isotopes from the Holocene back to the Marine Isotopic Stage 20.2, ~800 kyr BP. We here discuss the EDC records of Ba, Rb, Mo, Sb, Cd, Tl, Bi and Pb isotopes. Crustal elements such as Ba and Rb show well defined variations in concentrations in relation to climatic conditions with lower values during the interglacial periods and much higher values during the coldest periods of the last eight climatic cycles. Volcanogenic Cd, Tl and Bi show a less pronounced relationship between concentrations and climatic conditions. The isotopic signatures of Pb suggest that changes in the provenance of dust reaching the East Antarctic Plateau from Potential Source Areas occurred during the interglacial periods before the MBE. Our data suggest that the main factors affecting deposition fluxes and sources of natural trace elements over Antarctica are most likely linked to a progressive coupling of the climates of Antarctica and lower latitudes over the past 800 kyr.

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“…Post-glacial changes in atmospheric transport and/or provenance have been observed for dust particle sizes (Delmonte et al, 2004) and dust components such as Rare Earth Elements (Wegner et al, 2012;Gabrielli et al, 2010) and Pb isotopes (Vallelonga et al, 2010). The Talos Dome dust record does not demonstrate the "pre-Holocene dust minimum" observed in EDC, DB and Komosmolskaia ice cores in central East Antarctica (Delmonte et al, 2004), suggesting that different atmospheric transport regimes develop in these different sectors of Antarctica as interglacial conditions develop.…”

Section: Resultsmentioning

confidence: 99%

“…In central Antarctica, increased dust fluxes arise due to enhancement of the arid dust-deflation zones of southern South America in combination with reduced washout of dust (Lambert et al, 2008). Isotopic Vallelonga et al, 2010) and modelling (Li et al, 2008;Mahowald et al, 2005) investigations indicate changes in dust provenance from glacial to interglacial climates, with a dominant southern South American dust source during the glacial maxima and enhanced dust entrainment from Australia and local Antarctic ice-free areas during interglacial periods. Marine sediments demonstrate an increased production and/or transport of dust from southern South American sources during the late Pleistocene (Martinez-Garcia et al, 2009).…”

Section: Introductionmentioning

confidence: 98%

Iron fluxes to Talos Dome, Antarctica, over the past 200 kyr

et al. 2013

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Abstract. Atmospheric fluxes of iron (Fe) over the past 200 kyr are reported for the coastal Antarctic Talos Dome ice core, based on acid leachable Fe concentrations. Fluxes of Fe to Talos Dome were consistently greater than those at Dome C, with the greatest difference observed during interglacial climates. We observe different Fe flux trends at Dome C and Talos Dome during the deglaciation and early Holocene, attributed to a combination of deglacial activation of dust sources local to Talos Dome and the reorganisation of atmospheric transport pathways with the retreat of the Ross Sea ice shelf. This supports similar findings based on dust particle sizes and fluxes and Rare Earth Element fluxes. We show that Ca and Fe should not be used as quantitative proxies for mineral dust, as they all demonstrate different deglacial trends at Talos Dome and Dome C. Considering that a 20 ppmv decrease in atmospheric CO2 at the coldest part of the last glacial maximum occurs contemporaneously with the period of greatest Fe and dust flux to Antarctica, we confirm that the maximum contribution of aeolian dust deposition to Southern Ocean sequestration of atmospheric CO2 is approximately 20 ppmv.

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Lead isotopic compositions in the EPICA Dome C ice core and Southern Hemisphere Potential Source Areas

Cited by 94 publications

References 48 publications

A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice

A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice

Trace elements and Pb isotope records in Dome C (East Antarctica) ice over the past 800,000 years

Iron fluxes to Talos Dome, Antarctica, over the past 200 kyr

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